Hydraulic scraper



Oct- 29, 192.9 E. .1. `:AczKolaolcE 1,733,123

HYDRAULIC SCRAPER Filed Feb. 2s, 1929 2 sheets-sheet 1 Wiess: 3 -Bye mi y. f ATTORNEYS.

2 Sheets-Sheet 2 mw mw w 8 im f 1 w Wl [Il u Y B E. J. JACKoBolcE HYDRAULIC SCRAPER Filed Feb. 2s, 1929 Oct. 29, 1929.

A TTORNEYS.

Pamed oa. 29, 1929 EDWARD J'. JACKOBOCE, OF GRAND RAPIDS, MICHIGAN" HYDRAULIC SCRAPER Application led February 23, 1929. Serial No. 341,902.

This invention relates to h draulic operating and control mechanism flbr road s craper blades and the like adapted to be mounted on a motor truck.

The main objects of this invention are to provide an improved control and operating unit of the hydraulic ltype fora highway scraper blade; to provide a hydraulic operating unit which is extremely simple in construction with a minimum of moving parts; and, to provide such a unitl that will give long and satisfactory use with a minimum of upkeep and expense.

An illustrative embodiment of this invention is shown in theaccompanying drawings, in which:

Fig. 1 is a lview in rear elevation'of my improved device mounted on the chassis frame of a motor truck, a portion of the scraper blade being broken away tomore clearly show the operating mechanism.

' Fig. 2 is an enlarged transverse sectional view taken at the medial part of Fig. 1, with the scraper blade swung rearwardly to sub'- stantially its limit of movement.

Fig. 3 is a view similar to Fig. 2 but withv the hydraulic cylinder shown in section and with the scraper blade partially rotated to an upright position.

Fig. 4 is an enlarged fragmentary plan View of the medial portion of Fig. 1 vwith the supporting beam and bracket partially broken away to show the trunnion mounting of the hydraulic cylinder.

ings, a supporting beam -1 in the form of a heavy channel iron is shown mounted to the chassis frame 2 of a motor truck or the like by means of brackets 3, with the channel facing downwardly, that is, with the flanges of the channel iron` depending from the web. This supporting' beam 1 may be mounted on the truck chassis so as to be-horizontally swingable on a vertical axis if de- 5 sired, such swingable mounting beingcommon in the art and is for the purpose of varying the angle of the scraper blade with relation to the highway when the truck upon which it is mounted is being driven parallel to such highway.

In the construction shown `in the draw.

The medial portion of the supporting beam 1 is provided ,with a transversely disposed bracket arm` 4 riveted or otherwise rigidly fastened thereto and which has a forwardly extending arm 5, the outer end of which has -depending arms 6. The arms 6 support a pivot pin 7 whose axis is substantially parallel to the longitudinal axis of the supporting beam 1.

The lower side of the supporting beam 1 has the upper ends of a plurality of depending brackets 8 bolted or otherwise rigidly secured thereto. The lower ends of the brackets 8 are provided with bearings 9 the axes of which are in alignment and in which is journalled a rock shaft 10 in spaced parallel relation to the supporting beam 1.

Near its medial portion, the rock shaft 10 is provided with a pair of spaced parallel upstanding arms 11 rigidly mounted thereon the upper ends of -which pivotally support transversely disposed trunnions 12 and 13 integrally formed on diametrically opposite sides of a hydraulic cylinder 14.

The front end of the hydraulic cylinder 1.4 is provided with a packing gland 15 through which slidably passes a piston rod 16, .the inner end of which rigidly carries a piston 17. The outer end'of the piston rod 16 is provided with a bearing 18 which receives the pivot pin 7.

In order to conserve space and secure compactness of the unit, the depending flanges of the supporting channel beam 1 are cut' away adjacent the hydraulic cylinder when m'ounted in close relation to said supporting beam. The end of the hydraulic cylinder 14 'opposite to the packing gland 15 is provided with a hydraulic connection 19 to which is secured the customary flexible hydraulic hose 20 by which fluid may be introduced into the cylinder 14 back of the piston 17 for the purpose of causing a relative movement between the piston and cylinder.

The rock shaft 10 is also provided with a plurality of short arms 21 rigidly secured thereto, the outer ends of which ivotally support the upper ends of scraper b ade supportin arms 22 upon which a scraper blade 23 is rigidly mounted. 109

The scraper blade 23 is resiliently held in a normal position with respect to the yrocker arm by means of compression springs 24 and 25 respectively. The compression springs 24 and25 surround a rod 26 one end of which is mounted on lugs 27 secured to the rocker arm 10, the other end of which is provided with a washer 28 and nut29. The spring 25 bears between the washer 28 and the rear face of the arm 22. The spring 24 bearsbetween the front face of the arm 22 and the lugs 27.

Means are provided foi` normally rotating the scraper blade rearwardly and upwardly and comprise a pair of tension springs 30 and 31, each of which has its lower end secured to bracket clips 32 and\33 respectively which are secured to the rear face of the scraper blade .23. The upper ends of said springs are secured to theupwardly and rearwardly extending ends of brackets 34 and 35 respectively which are secured to the upper side of supporting beam 1.

In the operation of this device, the supporting beam 1 is secured to the chassis frame of a motor truck, either rigidly or adjustably as desired, and the flexible hydraulic hose 20l is attached to the discharge endv of a suitable hydraulic pump unit. -When there is s no pressure in the hydrauliccylinder, the tension springs 30 and 31 draw the scraper blade 23 upwardly and rearwardly as shown in v Fig. 2 of the drawingsso as to have clearance with respect to the roadway over which the motor truck is travelling.

'When it is desired to bring the' scraper yblade 23 in'contact with the highway, the

hydraulic pump is operated and fluid pumped into the hydraulic cylinder 14 through the flexible hydraulic hose 2O and connection 19. Introduction of the fluid into the cylinder 14 causes relative lnovement between the cylinder and the piston 17.l The piston rod 16 which supports the piston 17, being pivotally connected to the rigidly mounted bracket 4, causes the hydraulic cylinder 14 to move'rearwardly with respect to the supporting beam 1 and through the medium of the trunnion I connections 12 and 13 thus rotates the `arms 11 rearwardly. Such movement rotates the rock shaft 1() which in turn swings the scraper blade 23 downwardly and forwardly into contact with the highway.

Resilient contact of the scraperblade 23 wlth the highway is secured by means of the compression springs 24 and 25 so that if the scraper blade should contact with a more-or less rigid obstruction in the highway, the' scraper blade23 has limited rearward movement against the compression spring 25. After passing over the obstruction, the blades forward movement is resiliently checked by coming in contact with the compression spring 24.

The vertical angle of the scraper blade tion, the combination of a supporting beamv adapted to be secured to a chassis-frame, a rock shaft j ournalled on said beam, a scraper blade carried by said rock shaft, an arm rigidly secured to'said rock shaft, a hydraulic cylinder pivotally mounted ony said arm, a-

piston in said hydraulic cylinder and a piston rod having one end secure to said piston and its other end secured to said supporting beam.

2. In a hydraulic road scraper construction, the combination of a supporting beam adapted to be securedto a chassis frame, a bracket arm rigidly secured to and disposed transversely of said supporting beam, a bearing on the outer end of said arm, a rock shaft journalled on said beam, a scraper blade car'- riedby said rock shaft, an arm rigidly secured to said rock shaft, a hydraulic cylinder pivotall'y mounted on said arm, a piston in said hydraulic cylinder and a piston rod having one end secured to said piston and its p other end secured to said arm bracket.

3. In a hydraulic road scraper construction, the combination of a supporting Abeam adapted to be secured to a chassis frame, a

bracket arm rigidly secured to and disposed y transversely of said supporting beam, a bearing on the outer end of said arm, depending brackets on said beam, a rock shaft journalled on ried byI said rock shaft, a rocker arm on said rock shaft, a hydraulic cylindery pivoted to said rocker arm, a piston in said cylinder, a piston rod connectingsaid piston and said the lower ends of said depend-y ing brackets, a scraper blade resiliently carbeam bracket arm bearing, and means for ml troducing fluid into said cylinder for causing relatlve movement between saidcylinder and piston to vary the angle of contact of said scraper blade.

4. In a hydraulic road scraper construc-I tion, the combination of a supporting beam adapted to be secured to a chassis frame, depending brackets on said beam, a rock shaft journal a scraper blade carried by said tending trunnion bearingson said rock` shaft, a hydraulic cylinder em raced by said beared on the lower ends of said depend ing brackets,

rock shaft movable therewith, upwardly exiao ings, diametricallympposed outwardly-extending trunnions on said hydraulic cylinder journalled in said bearings, a piston in said hydraulic cylinder, a piston rod slidable in one end of said cylinder with one end thereof secured to said piston and the other end thereof pivotally attached to said supporting beam, and means for introducing fluid in said cylinder to cause relative movement between said piston and cylinder to rock Said scraper blade for varying its angle of contact with respect to a highway.

In testimony whereof I have hereunto set my hand at Grand Rapids, Michigan, this 19th day of February, 1929.

EDVARD J. JACKOBOICE. 

